1 /* 2 * event notifier support 3 * 4 * Copyright Red Hat, Inc. 2010 5 * 6 * Authors: 7 * Michael S. Tsirkin <mst@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "qemu-common.h" 15 #include "qemu/event_notifier.h" 16 #include "qemu/main-loop.h" 17 18 int event_notifier_init(EventNotifier *e, int active) 19 { 20 e->event = CreateEvent(NULL, TRUE, FALSE, NULL); 21 assert(e->event); 22 return 0; 23 } 24 25 void event_notifier_cleanup(EventNotifier *e) 26 { 27 CloseHandle(e->event); 28 } 29 30 HANDLE event_notifier_get_handle(EventNotifier *e) 31 { 32 return e->event; 33 } 34 35 int event_notifier_set_handler(EventNotifier *e, 36 bool is_external, 37 EventNotifierHandler *handler) 38 { 39 if (handler) { 40 return qemu_add_wait_object(e->event, (IOHandler *)handler, e); 41 } else { 42 qemu_del_wait_object(e->event, (IOHandler *)handler, e); 43 return 0; 44 } 45 } 46 47 int event_notifier_set(EventNotifier *e) 48 { 49 SetEvent(e->event); 50 return 0; 51 } 52 53 int event_notifier_test_and_clear(EventNotifier *e) 54 { 55 int ret = WaitForSingleObject(e->event, 0); 56 if (ret == WAIT_OBJECT_0) { 57 ResetEvent(e->event); 58 return true; 59 } 60 return false; 61 } 62